Class-6 Sub Science Chapter-8 Body Movements

 Chapter 8 – Body Movements

                       Class-6

Question 1:Fill in the blanks:

 (a) Joints of bones help in the __movement__ of body.

(b) A combination of bones and cartilages forms the __skeleton__ of the body.

(c) Bones at the elbow are joined by a __hinge__ joint.

(d) The contraction of the __muscle__ pulls the bones during movement.

Question 2: Indicate true (T) or false (F) for the following sentences.

 (a) Movement and locomotion of all animals is exactly the same. (False)

(b) Cartilages are harder than bones. (False)

(c) Finger bones do not have joints. (False)

(d) The fore arm has two bones. (True)

(e) Cockroaches have an outer skeleton. (True)

Question 3:Match the items in Column I with one or more items in Column II.

Answer:

Column I	Column II
Upper jaw	is an immovable joint
Fishes	have a streamlined body; have fins on the body
Ribs	protect the heart
Snail	shows very slow movement
Cockroach	has an outer skeleton; can fly in the air

Question 4:Answer the following:

(a) What is a ball and socket joint?

Ans (a) Ball and socket joint is a movable joint. It consists of a bone that has a round head, which fits into a cup like depression of another bone. This helps the bone to rotate freely. Examples of such joints are hip and shoulder joints.

(b) Which of the skull bones are movable?

Ans (b) Mandible bone which forms the lower jaw is the only skull bone that is movable.

 (c) Why can our elbow not move backwards?

Ans (c) The elbow has a hinge joint. This type of a joint allows the movement in one plane only. Therefore, our elbow cannot move backwards.